| 1 | /* movemail foo bar -- move file foo to file bar, |
| 2 | locking file foo the way /bin/mail respects. |
| 3 | Copyright (C) 1986, 1992, 1993, 1994, 1996, 1999, 2001, 2002, 2003, 2004, |
| 4 | 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GNU Emacs. |
| 7 | |
| 8 | GNU Emacs is free software: you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation, either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | GNU Emacs is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | |
| 22 | /* Important notice: defining MAIL_USE_FLOCK or MAIL_USE_LOCKF *will |
| 23 | cause loss of mail* if you do it on a system that does not normally |
| 24 | use flock as its way of interlocking access to inbox files. The |
| 25 | setting of MAIL_USE_FLOCK and MAIL_USE_LOCKF *must agree* with the |
| 26 | system's own conventions. It is not a choice that is up to you. |
| 27 | |
| 28 | So, if your system uses lock files rather than flock, then the only way |
| 29 | you can get proper operation is to enable movemail to write lockfiles there. |
| 30 | This means you must either give that directory access modes |
| 31 | that permit everyone to write lockfiles in it, or you must make movemail |
| 32 | a setuid or setgid program. */ |
| 33 | |
| 34 | /* |
| 35 | * Modified January, 1986 by Michael R. Gretzinger (Project Athena) |
| 36 | * |
| 37 | * Added POP (Post Office Protocol) service. When compiled -DMAIL_USE_POP |
| 38 | * movemail will accept input filename arguments of the form |
| 39 | * "po:username". This will cause movemail to open a connection to |
| 40 | * a pop server running on $MAILHOST (environment variable). Movemail |
| 41 | * must be setuid to root in order to work with POP. |
| 42 | * |
| 43 | * New module: popmail.c |
| 44 | * Modified routines: |
| 45 | * main - added code within #ifdef MAIL_USE_POP; added setuid (getuid ()) |
| 46 | * after POP code. |
| 47 | * New routines in movemail.c: |
| 48 | * get_errmsg - return pointer to system error message |
| 49 | * |
| 50 | * Modified August, 1993 by Jonathan Kamens (OpenVision Technologies) |
| 51 | * |
| 52 | * Move all of the POP code into a separate file, "pop.c". |
| 53 | * Use strerror instead of get_errmsg. |
| 54 | * |
| 55 | */ |
| 56 | |
| 57 | #include <config.h> |
| 58 | #include <sys/types.h> |
| 59 | #include <sys/stat.h> |
| 60 | #include <sys/file.h> |
| 61 | #include <stdio.h> |
| 62 | #include <errno.h> |
| 63 | #include <time.h> |
| 64 | |
| 65 | #include <getopt.h> |
| 66 | #ifdef HAVE_UNISTD_H |
| 67 | #include <unistd.h> |
| 68 | #endif |
| 69 | #ifdef HAVE_FCNTL_H |
| 70 | #include <fcntl.h> |
| 71 | #endif |
| 72 | #include "syswait.h" |
| 73 | #ifdef MAIL_USE_POP |
| 74 | #include "pop.h" |
| 75 | #endif |
| 76 | |
| 77 | #ifdef MSDOS |
| 78 | #undef access |
| 79 | #endif /* MSDOS */ |
| 80 | |
| 81 | #ifndef DIRECTORY_SEP |
| 82 | #define DIRECTORY_SEP '/' |
| 83 | #endif |
| 84 | #ifndef IS_DIRECTORY_SEP |
| 85 | #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP) |
| 86 | #endif |
| 87 | |
| 88 | #ifdef WINDOWSNT |
| 89 | #include "ntlib.h" |
| 90 | #undef access |
| 91 | #undef unlink |
| 92 | #define fork() 0 |
| 93 | #define wait(var) (*(var) = 0) |
| 94 | /* Unfortunately, Samba doesn't seem to properly lock Unix files even |
| 95 | though the locking call succeeds (and indeed blocks local access from |
| 96 | other NT programs). If you have direct file access using an NFS |
| 97 | client or something other than Samba, the locking call might work |
| 98 | properly - make sure it does before you enable this! |
| 99 | |
| 100 | [18-Feb-97 andrewi] I now believe my comment above to be incorrect, |
| 101 | since it was based on a misunderstanding of how locking calls are |
| 102 | implemented and used on Unix. */ |
| 103 | //#define DISABLE_DIRECT_ACCESS |
| 104 | |
| 105 | #include <fcntl.h> |
| 106 | #endif /* WINDOWSNT */ |
| 107 | |
| 108 | #ifndef F_OK |
| 109 | #define F_OK 0 |
| 110 | #define X_OK 1 |
| 111 | #define W_OK 2 |
| 112 | #define R_OK 4 |
| 113 | #endif |
| 114 | |
| 115 | #ifdef WINDOWSNT |
| 116 | #include <sys/locking.h> |
| 117 | #endif |
| 118 | |
| 119 | #ifdef MAIL_USE_LOCKF |
| 120 | #define MAIL_USE_SYSTEM_LOCK |
| 121 | #endif |
| 122 | |
| 123 | #ifdef MAIL_USE_FLOCK |
| 124 | #define MAIL_USE_SYSTEM_LOCK |
| 125 | #endif |
| 126 | |
| 127 | #ifdef MAIL_USE_MMDF |
| 128 | extern int lk_open (), lk_close (); |
| 129 | #endif |
| 130 | |
| 131 | #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \ |
| 132 | (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \ |
| 133 | defined (HAVE_MAILLOCK_H) |
| 134 | #include <maillock.h> |
| 135 | /* We can't use maillock unless we know what directory system mail |
| 136 | files appear in. */ |
| 137 | #ifdef MAILDIR |
| 138 | #define MAIL_USE_MAILLOCK |
| 139 | static char *mail_spool_name (); |
| 140 | #endif |
| 141 | #endif |
| 142 | |
| 143 | #ifndef errno |
| 144 | extern int errno; |
| 145 | #endif |
| 146 | char *strerror (); |
| 147 | #ifdef HAVE_INDEX |
| 148 | extern char *index __P ((const char *, int)); |
| 149 | #endif |
| 150 | #ifdef HAVE_RINDEX |
| 151 | extern char *rindex __P((const char *, int)); |
| 152 | #endif |
| 153 | |
| 154 | void fatal (); |
| 155 | void error (); |
| 156 | void pfatal_with_name (); |
| 157 | void pfatal_and_delete (); |
| 158 | char *concat (); |
| 159 | long *xmalloc (); |
| 160 | int popmail (); |
| 161 | int pop_retr (); |
| 162 | int mbx_write (); |
| 163 | int mbx_delimit_begin (); |
| 164 | int mbx_delimit_end (); |
| 165 | |
| 166 | /* Nonzero means this is name of a lock file to delete on fatal error. */ |
| 167 | char *delete_lockname; |
| 168 | |
| 169 | int |
| 170 | main (argc, argv) |
| 171 | int argc; |
| 172 | char **argv; |
| 173 | { |
| 174 | char *inname, *outname; |
| 175 | int indesc, outdesc; |
| 176 | int nread; |
| 177 | int status; |
| 178 | int c, preserve_mail = 0; |
| 179 | |
| 180 | #ifndef MAIL_USE_SYSTEM_LOCK |
| 181 | struct stat st; |
| 182 | long now; |
| 183 | int tem; |
| 184 | char *lockname, *p; |
| 185 | char *tempname; |
| 186 | int desc; |
| 187 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
| 188 | |
| 189 | #ifdef MAIL_USE_MAILLOCK |
| 190 | char *spool_name; |
| 191 | #endif |
| 192 | |
| 193 | #ifdef MAIL_USE_POP |
| 194 | int pop_reverse_order = 0; |
| 195 | # define ARGSTR "pr" |
| 196 | #else /* ! MAIL_USE_POP */ |
| 197 | # define ARGSTR "p" |
| 198 | #endif /* MAIL_USE_POP */ |
| 199 | |
| 200 | #ifdef WINDOWSNT |
| 201 | /* Ensure all file i/o is in binary mode. */ |
| 202 | _fmode = _O_BINARY; |
| 203 | #endif |
| 204 | |
| 205 | delete_lockname = 0; |
| 206 | |
| 207 | while ((c = getopt (argc, argv, ARGSTR)) != EOF) |
| 208 | { |
| 209 | switch (c) { |
| 210 | #ifdef MAIL_USE_POP |
| 211 | case 'r': |
| 212 | pop_reverse_order = 1; |
| 213 | break; |
| 214 | #endif |
| 215 | case 'p': |
| 216 | preserve_mail++; |
| 217 | break; |
| 218 | default: |
| 219 | exit (EXIT_FAILURE); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | if ( |
| 224 | #ifdef MAIL_USE_POP |
| 225 | (argc - optind < 2) || (argc - optind > 3) |
| 226 | #else |
| 227 | (argc - optind != 2) |
| 228 | #endif |
| 229 | ) |
| 230 | { |
| 231 | #ifdef MAIL_USE_POP |
| 232 | fprintf (stderr, "Usage: movemail [-p] [-r] inbox destfile%s\n", |
| 233 | " [POP-password]"); |
| 234 | #else |
| 235 | fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", ""); |
| 236 | #endif |
| 237 | exit (EXIT_FAILURE); |
| 238 | } |
| 239 | |
| 240 | inname = argv[optind]; |
| 241 | outname = argv[optind+1]; |
| 242 | |
| 243 | #ifdef MAIL_USE_MMDF |
| 244 | mmdf_init (argv[0]); |
| 245 | #endif |
| 246 | |
| 247 | if (*outname == 0) |
| 248 | fatal ("Destination file name is empty", 0, 0); |
| 249 | |
| 250 | /* Check access to output file. */ |
| 251 | if (access (outname, F_OK) == 0 && access (outname, W_OK) != 0) |
| 252 | pfatal_with_name (outname); |
| 253 | |
| 254 | /* Also check that outname's directory is writable to the real uid. */ |
| 255 | { |
| 256 | char *buf = (char *) xmalloc (strlen (outname) + 1); |
| 257 | char *p; |
| 258 | strcpy (buf, outname); |
| 259 | p = buf + strlen (buf); |
| 260 | while (p > buf && !IS_DIRECTORY_SEP (p[-1])) |
| 261 | *--p = 0; |
| 262 | if (p == buf) |
| 263 | *p++ = '.'; |
| 264 | if (access (buf, W_OK) != 0) |
| 265 | pfatal_with_name (buf); |
| 266 | free (buf); |
| 267 | } |
| 268 | |
| 269 | #ifdef MAIL_USE_POP |
| 270 | if (!strncmp (inname, "po:", 3)) |
| 271 | { |
| 272 | int status; |
| 273 | |
| 274 | status = popmail (inname + 3, outname, preserve_mail, |
| 275 | (argc - optind == 3) ? argv[optind+2] : NULL, |
| 276 | pop_reverse_order); |
| 277 | exit (status); |
| 278 | } |
| 279 | |
| 280 | setuid (getuid ()); |
| 281 | #endif /* MAIL_USE_POP */ |
| 282 | |
| 283 | #ifndef DISABLE_DIRECT_ACCESS |
| 284 | |
| 285 | /* Check access to input file. */ |
| 286 | if (access (inname, R_OK | W_OK) != 0) |
| 287 | pfatal_with_name (inname); |
| 288 | |
| 289 | #ifndef MAIL_USE_MMDF |
| 290 | #ifndef MAIL_USE_SYSTEM_LOCK |
| 291 | #ifdef MAIL_USE_MAILLOCK |
| 292 | spool_name = mail_spool_name (inname); |
| 293 | if (! spool_name) |
| 294 | #endif |
| 295 | { |
| 296 | /* Use a lock file named after our first argument with .lock appended: |
| 297 | If it exists, the mail file is locked. */ |
| 298 | /* Note: this locking mechanism is *required* by the mailer |
| 299 | (on systems which use it) to prevent loss of mail. |
| 300 | |
| 301 | On systems that use a lock file, extracting the mail without locking |
| 302 | WILL occasionally cause loss of mail due to timing errors! |
| 303 | |
| 304 | So, if creation of the lock file fails |
| 305 | due to access permission on the mail spool directory, |
| 306 | you simply MUST change the permission |
| 307 | and/or make movemail a setgid program |
| 308 | so it can create lock files properly. |
| 309 | |
| 310 | You might also wish to verify that your system is one |
| 311 | which uses lock files for this purpose. Some systems use other methods. |
| 312 | |
| 313 | If your system uses the `flock' system call for mail locking, |
| 314 | define MAIL_USE_SYSTEM_LOCK in config.h or the s-*.h file |
| 315 | and recompile movemail. If the s- file for your system |
| 316 | should define MAIL_USE_SYSTEM_LOCK but does not, send a bug report |
| 317 | to bug-gnu-emacs@prep.ai.mit.edu so we can fix it. */ |
| 318 | |
| 319 | lockname = concat (inname, ".lock", ""); |
| 320 | tempname = (char *) xmalloc (strlen (inname) + strlen ("EXXXXXX") + 1); |
| 321 | strcpy (tempname, inname); |
| 322 | p = tempname + strlen (tempname); |
| 323 | while (p != tempname && !IS_DIRECTORY_SEP (p[-1])) |
| 324 | p--; |
| 325 | *p = 0; |
| 326 | strcpy (p, "EXXXXXX"); |
| 327 | mktemp (tempname); |
| 328 | unlink (tempname); |
| 329 | |
| 330 | while (1) |
| 331 | { |
| 332 | /* Create the lock file, but not under the lock file name. */ |
| 333 | /* Give up if cannot do that. */ |
| 334 | desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0666); |
| 335 | if (desc < 0) |
| 336 | { |
| 337 | char *message = (char *) xmalloc (strlen (tempname) + 50); |
| 338 | sprintf (message, "creating %s, which would become the lock file", |
| 339 | tempname); |
| 340 | pfatal_with_name (message); |
| 341 | } |
| 342 | close (desc); |
| 343 | |
| 344 | tem = link (tempname, lockname); |
| 345 | |
| 346 | #ifdef EPERM |
| 347 | if (tem < 0 && errno == EPERM) |
| 348 | fatal ("Unable to create hard link between %s and %s", |
| 349 | tempname, lockname); |
| 350 | #endif |
| 351 | |
| 352 | unlink (tempname); |
| 353 | if (tem >= 0) |
| 354 | break; |
| 355 | sleep (1); |
| 356 | |
| 357 | /* If lock file is five minutes old, unlock it. |
| 358 | Five minutes should be good enough to cope with crashes |
| 359 | and wedgitude, and long enough to avoid being fooled |
| 360 | by time differences between machines. */ |
| 361 | if (stat (lockname, &st) >= 0) |
| 362 | { |
| 363 | now = time (0); |
| 364 | if (st.st_ctime < now - 300) |
| 365 | unlink (lockname); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | delete_lockname = lockname; |
| 370 | } |
| 371 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
| 372 | #endif /* not MAIL_USE_MMDF */ |
| 373 | |
| 374 | if (fork () == 0) |
| 375 | { |
| 376 | int lockcount = 0; |
| 377 | int status = 0; |
| 378 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) |
| 379 | time_t touched_lock, now; |
| 380 | #endif |
| 381 | |
| 382 | setuid (getuid ()); |
| 383 | |
| 384 | #ifndef MAIL_USE_MMDF |
| 385 | #ifdef MAIL_USE_SYSTEM_LOCK |
| 386 | indesc = open (inname, O_RDWR); |
| 387 | #else /* if not MAIL_USE_SYSTEM_LOCK */ |
| 388 | indesc = open (inname, O_RDONLY); |
| 389 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
| 390 | #else /* MAIL_USE_MMDF */ |
| 391 | indesc = lk_open (inname, O_RDONLY, 0, 0, 10); |
| 392 | #endif /* MAIL_USE_MMDF */ |
| 393 | |
| 394 | if (indesc < 0) |
| 395 | pfatal_with_name (inname); |
| 396 | |
| 397 | #ifdef BSD_SYSTEM |
| 398 | /* In case movemail is setuid to root, make sure the user can |
| 399 | read the output file. */ |
| 400 | /* This is desirable for all systems |
| 401 | but I don't want to assume all have the umask system call */ |
| 402 | umask (umask (0) & 0333); |
| 403 | #endif /* BSD_SYSTEM */ |
| 404 | outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666); |
| 405 | if (outdesc < 0) |
| 406 | pfatal_with_name (outname); |
| 407 | |
| 408 | /* This label exists so we can retry locking |
| 409 | after a delay, if it got EAGAIN or EBUSY. */ |
| 410 | retry_lock: |
| 411 | |
| 412 | /* Try to lock it. */ |
| 413 | #ifdef MAIL_USE_MAILLOCK |
| 414 | if (spool_name) |
| 415 | { |
| 416 | /* The "0 - " is to make it a negative number if maillock returns |
| 417 | non-zero. */ |
| 418 | status = 0 - maillock (spool_name, 1); |
| 419 | #ifdef HAVE_TOUCHLOCK |
| 420 | touched_lock = time (0); |
| 421 | #endif |
| 422 | lockcount = 5; |
| 423 | } |
| 424 | else |
| 425 | #endif /* MAIL_USE_MAILLOCK */ |
| 426 | { |
| 427 | #ifdef MAIL_USE_SYSTEM_LOCK |
| 428 | #ifdef MAIL_USE_LOCKF |
| 429 | status = lockf (indesc, F_LOCK, 0); |
| 430 | #else /* not MAIL_USE_LOCKF */ |
| 431 | #ifdef WINDOWSNT |
| 432 | status = locking (indesc, LK_RLCK, -1L); |
| 433 | #else |
| 434 | status = flock (indesc, LOCK_EX); |
| 435 | #endif |
| 436 | #endif /* not MAIL_USE_LOCKF */ |
| 437 | #endif /* MAIL_USE_SYSTEM_LOCK */ |
| 438 | } |
| 439 | |
| 440 | /* If it fails, retry up to 5 times |
| 441 | for certain failure codes. */ |
| 442 | if (status < 0) |
| 443 | { |
| 444 | if (++lockcount <= 5) |
| 445 | { |
| 446 | #ifdef EAGAIN |
| 447 | if (errno == EAGAIN) |
| 448 | { |
| 449 | sleep (1); |
| 450 | goto retry_lock; |
| 451 | } |
| 452 | #endif |
| 453 | #ifdef EBUSY |
| 454 | if (errno == EBUSY) |
| 455 | { |
| 456 | sleep (1); |
| 457 | goto retry_lock; |
| 458 | } |
| 459 | #endif |
| 460 | } |
| 461 | |
| 462 | pfatal_with_name (inname); |
| 463 | } |
| 464 | |
| 465 | { |
| 466 | char buf[1024]; |
| 467 | |
| 468 | while (1) |
| 469 | { |
| 470 | nread = read (indesc, buf, sizeof buf); |
| 471 | if (nread < 0) |
| 472 | pfatal_with_name (inname); |
| 473 | if (nread != write (outdesc, buf, nread)) |
| 474 | { |
| 475 | int saved_errno = errno; |
| 476 | unlink (outname); |
| 477 | errno = saved_errno; |
| 478 | pfatal_with_name (outname); |
| 479 | } |
| 480 | if (nread < sizeof buf) |
| 481 | break; |
| 482 | #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK) |
| 483 | if (spool_name) |
| 484 | { |
| 485 | now = time (0); |
| 486 | if (now - touched_lock > 60) |
| 487 | { |
| 488 | touchlock (); |
| 489 | touched_lock = now; |
| 490 | } |
| 491 | } |
| 492 | #endif /* MAIL_USE_MAILLOCK */ |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | #ifdef BSD_SYSTEM |
| 497 | if (fsync (outdesc) < 0) |
| 498 | pfatal_and_delete (outname); |
| 499 | #endif |
| 500 | |
| 501 | /* Check to make sure no errors before we zap the inbox. */ |
| 502 | if (close (outdesc) != 0) |
| 503 | pfatal_and_delete (outname); |
| 504 | |
| 505 | #ifdef MAIL_USE_SYSTEM_LOCK |
| 506 | if (! preserve_mail) |
| 507 | { |
| 508 | ftruncate (indesc, 0L); |
| 509 | } |
| 510 | #endif /* MAIL_USE_SYSTEM_LOCK */ |
| 511 | |
| 512 | #ifdef MAIL_USE_MMDF |
| 513 | lk_close (indesc, 0, 0, 0); |
| 514 | #else |
| 515 | close (indesc); |
| 516 | #endif |
| 517 | |
| 518 | #ifndef MAIL_USE_SYSTEM_LOCK |
| 519 | if (! preserve_mail) |
| 520 | { |
| 521 | /* Delete the input file; if we can't, at least get rid of its |
| 522 | contents. */ |
| 523 | #ifdef MAIL_UNLINK_SPOOL |
| 524 | /* This is generally bad to do, because it destroys the permissions |
| 525 | that were set on the file. Better to just empty the file. */ |
| 526 | if (unlink (inname) < 0 && errno != ENOENT) |
| 527 | #endif /* MAIL_UNLINK_SPOOL */ |
| 528 | creat (inname, 0600); |
| 529 | } |
| 530 | #endif /* not MAIL_USE_SYSTEM_LOCK */ |
| 531 | |
| 532 | #ifdef MAIL_USE_MAILLOCK |
| 533 | /* This has to occur in the child, i.e., in the process that |
| 534 | acquired the lock! */ |
| 535 | if (spool_name) |
| 536 | mailunlock (); |
| 537 | #endif |
| 538 | exit (EXIT_SUCCESS); |
| 539 | } |
| 540 | |
| 541 | wait (&status); |
| 542 | if (!WIFEXITED (status)) |
| 543 | exit (EXIT_FAILURE); |
| 544 | else if (WRETCODE (status) != 0) |
| 545 | exit (WRETCODE (status)); |
| 546 | |
| 547 | #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK) |
| 548 | #ifdef MAIL_USE_MAILLOCK |
| 549 | if (! spool_name) |
| 550 | #endif /* MAIL_USE_MAILLOCK */ |
| 551 | unlink (lockname); |
| 552 | #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */ |
| 553 | |
| 554 | #endif /* ! DISABLE_DIRECT_ACCESS */ |
| 555 | |
| 556 | return EXIT_SUCCESS; |
| 557 | } |
| 558 | |
| 559 | #ifdef MAIL_USE_MAILLOCK |
| 560 | /* This function uses stat to confirm that the mail directory is |
| 561 | identical to the directory of the input file, rather than just |
| 562 | string-comparing the two paths, because one or both of them might |
| 563 | be symbolic links pointing to some other directory. */ |
| 564 | static char * |
| 565 | mail_spool_name (inname) |
| 566 | char *inname; |
| 567 | { |
| 568 | struct stat stat1, stat2; |
| 569 | char *indir, *fname; |
| 570 | int status; |
| 571 | |
| 572 | if (! (fname = rindex (inname, '/'))) |
| 573 | return NULL; |
| 574 | |
| 575 | fname++; |
| 576 | |
| 577 | if (stat (MAILDIR, &stat1) < 0) |
| 578 | return NULL; |
| 579 | |
| 580 | indir = (char *) xmalloc (fname - inname + 1); |
| 581 | strncpy (indir, inname, fname - inname); |
| 582 | indir[fname-inname] = '\0'; |
| 583 | |
| 584 | |
| 585 | status = stat (indir, &stat2); |
| 586 | |
| 587 | free (indir); |
| 588 | |
| 589 | if (status < 0) |
| 590 | return NULL; |
| 591 | |
| 592 | if (stat1.st_dev == stat2.st_dev |
| 593 | && stat1.st_ino == stat2.st_ino) |
| 594 | return fname; |
| 595 | |
| 596 | return NULL; |
| 597 | } |
| 598 | #endif /* MAIL_USE_MAILLOCK */ |
| 599 | \f |
| 600 | /* Print error message and exit. */ |
| 601 | |
| 602 | void |
| 603 | fatal (s1, s2, s3) |
| 604 | char *s1, *s2, *s3; |
| 605 | { |
| 606 | if (delete_lockname) |
| 607 | unlink (delete_lockname); |
| 608 | error (s1, s2, s3); |
| 609 | exit (EXIT_FAILURE); |
| 610 | } |
| 611 | |
| 612 | /* Print error message. `s1' is printf control string, `s2' and `s3' |
| 613 | are args for it or null. */ |
| 614 | |
| 615 | void |
| 616 | error (s1, s2, s3) |
| 617 | char *s1, *s2, *s3; |
| 618 | { |
| 619 | fprintf (stderr, "movemail: "); |
| 620 | if (s3) |
| 621 | fprintf (stderr, s1, s2, s3); |
| 622 | else if (s2) |
| 623 | fprintf (stderr, s1, s2); |
| 624 | else |
| 625 | fprintf (stderr, s1); |
| 626 | fprintf (stderr, "\n"); |
| 627 | } |
| 628 | |
| 629 | void |
| 630 | pfatal_with_name (name) |
| 631 | char *name; |
| 632 | { |
| 633 | fatal ("%s for %s", strerror (errno), name); |
| 634 | } |
| 635 | |
| 636 | void |
| 637 | pfatal_and_delete (name) |
| 638 | char *name; |
| 639 | { |
| 640 | char *s = strerror (errno); |
| 641 | unlink (name); |
| 642 | fatal ("%s for %s", s, name); |
| 643 | } |
| 644 | |
| 645 | /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3. */ |
| 646 | |
| 647 | char * |
| 648 | concat (s1, s2, s3) |
| 649 | char *s1, *s2, *s3; |
| 650 | { |
| 651 | int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3); |
| 652 | char *result = (char *) xmalloc (len1 + len2 + len3 + 1); |
| 653 | |
| 654 | strcpy (result, s1); |
| 655 | strcpy (result + len1, s2); |
| 656 | strcpy (result + len1 + len2, s3); |
| 657 | *(result + len1 + len2 + len3) = 0; |
| 658 | |
| 659 | return result; |
| 660 | } |
| 661 | |
| 662 | /* Like malloc but get fatal error if memory is exhausted. */ |
| 663 | |
| 664 | long * |
| 665 | xmalloc (size) |
| 666 | unsigned size; |
| 667 | { |
| 668 | long *result = (long *) malloc (size); |
| 669 | if (!result) |
| 670 | fatal ("virtual memory exhausted", 0, 0); |
| 671 | return result; |
| 672 | } |
| 673 | \f |
| 674 | /* This is the guts of the interface to the Post Office Protocol. */ |
| 675 | |
| 676 | #ifdef MAIL_USE_POP |
| 677 | |
| 678 | #ifndef WINDOWSNT |
| 679 | #include <sys/socket.h> |
| 680 | #include <netinet/in.h> |
| 681 | #include <netdb.h> |
| 682 | #else |
| 683 | #undef _WINSOCKAPI_ |
| 684 | #include <winsock.h> |
| 685 | #endif |
| 686 | #include <pwd.h> |
| 687 | #include <string.h> |
| 688 | |
| 689 | #define NOTOK (-1) |
| 690 | #define OK 0 |
| 691 | #define DONE 1 |
| 692 | |
| 693 | char *progname; |
| 694 | FILE *sfi; |
| 695 | FILE *sfo; |
| 696 | char ibuffer[BUFSIZ]; |
| 697 | char obuffer[BUFSIZ]; |
| 698 | char Errmsg[200]; /* POP errors, at least, can exceed |
| 699 | the original length of 80. */ |
| 700 | |
| 701 | /* |
| 702 | * The full valid syntax for a POP mailbox specification for movemail |
| 703 | * is "po:username:hostname". The ":hostname" is optional; if it is |
| 704 | * omitted, the MAILHOST environment variable will be consulted. Note |
| 705 | * that by the time popmail() is called the "po:" has been stripped |
| 706 | * off of the front of the mailbox name. |
| 707 | * |
| 708 | * If the mailbox is in the form "po:username:hostname", then it is |
| 709 | * modified by this function -- the second colon is replaced by a |
| 710 | * null. |
| 711 | * |
| 712 | * Return a value suitable for passing to `exit'. |
| 713 | */ |
| 714 | |
| 715 | int |
| 716 | popmail (mailbox, outfile, preserve, password, reverse_order) |
| 717 | char *mailbox; |
| 718 | char *outfile; |
| 719 | int preserve; |
| 720 | char *password; |
| 721 | int reverse_order; |
| 722 | { |
| 723 | int nmsgs, nbytes; |
| 724 | register int i; |
| 725 | int mbfi; |
| 726 | FILE *mbf; |
| 727 | char *getenv (); |
| 728 | popserver server; |
| 729 | int start, end, increment; |
| 730 | char *user, *hostname; |
| 731 | |
| 732 | user = mailbox; |
| 733 | if ((hostname = index(mailbox, ':'))) |
| 734 | *hostname++ = '\0'; |
| 735 | |
| 736 | server = pop_open (hostname, user, password, POP_NO_GETPASS); |
| 737 | if (! server) |
| 738 | { |
| 739 | error ("Error connecting to POP server: %s", pop_error, 0); |
| 740 | return EXIT_FAILURE; |
| 741 | } |
| 742 | |
| 743 | if (pop_stat (server, &nmsgs, &nbytes)) |
| 744 | { |
| 745 | error ("Error getting message count from POP server: %s", pop_error, 0); |
| 746 | return EXIT_FAILURE; |
| 747 | } |
| 748 | |
| 749 | if (!nmsgs) |
| 750 | { |
| 751 | pop_close (server); |
| 752 | return EXIT_SUCCESS; |
| 753 | } |
| 754 | |
| 755 | mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666); |
| 756 | if (mbfi < 0) |
| 757 | { |
| 758 | pop_close (server); |
| 759 | error ("Error in open: %s, %s", strerror (errno), outfile); |
| 760 | return EXIT_FAILURE; |
| 761 | } |
| 762 | fchown (mbfi, getuid (), -1); |
| 763 | |
| 764 | if ((mbf = fdopen (mbfi, "wb")) == NULL) |
| 765 | { |
| 766 | pop_close (server); |
| 767 | error ("Error in fdopen: %s", strerror (errno), 0); |
| 768 | close (mbfi); |
| 769 | unlink (outfile); |
| 770 | return EXIT_FAILURE; |
| 771 | } |
| 772 | |
| 773 | if (reverse_order) |
| 774 | { |
| 775 | start = nmsgs; |
| 776 | end = 1; |
| 777 | increment = -1; |
| 778 | } |
| 779 | else |
| 780 | { |
| 781 | start = 1; |
| 782 | end = nmsgs; |
| 783 | increment = 1; |
| 784 | } |
| 785 | |
| 786 | for (i = start; i * increment <= end * increment; i += increment) |
| 787 | { |
| 788 | mbx_delimit_begin (mbf); |
| 789 | if (pop_retr (server, i, mbf) != OK) |
| 790 | { |
| 791 | error ("%s", Errmsg, 0); |
| 792 | close (mbfi); |
| 793 | return EXIT_FAILURE; |
| 794 | } |
| 795 | mbx_delimit_end (mbf); |
| 796 | fflush (mbf); |
| 797 | if (ferror (mbf)) |
| 798 | { |
| 799 | error ("Error in fflush: %s", strerror (errno), 0); |
| 800 | pop_close (server); |
| 801 | close (mbfi); |
| 802 | return EXIT_FAILURE; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | /* On AFS, a call to write only modifies the file in the local |
| 807 | * workstation's AFS cache. The changes are not written to the server |
| 808 | * until a call to fsync or close is made. Users with AFS home |
| 809 | * directories have lost mail when over quota because these checks were |
| 810 | * not made in previous versions of movemail. */ |
| 811 | |
| 812 | #ifdef BSD_SYSTEM |
| 813 | if (fsync (mbfi) < 0) |
| 814 | { |
| 815 | error ("Error in fsync: %s", strerror (errno), 0); |
| 816 | return EXIT_FAILURE; |
| 817 | } |
| 818 | #endif |
| 819 | |
| 820 | if (close (mbfi) == -1) |
| 821 | { |
| 822 | error ("Error in close: %s", strerror (errno), 0); |
| 823 | return EXIT_FAILURE; |
| 824 | } |
| 825 | |
| 826 | if (! preserve) |
| 827 | for (i = 1; i <= nmsgs; i++) |
| 828 | { |
| 829 | if (pop_delete (server, i)) |
| 830 | { |
| 831 | error ("Error from POP server: %s", pop_error, 0); |
| 832 | pop_close (server); |
| 833 | return EXIT_FAILURE; |
| 834 | } |
| 835 | } |
| 836 | |
| 837 | if (pop_quit (server)) |
| 838 | { |
| 839 | error ("Error from POP server: %s", pop_error, 0); |
| 840 | return EXIT_FAILURE; |
| 841 | } |
| 842 | |
| 843 | return EXIT_SUCCESS; |
| 844 | } |
| 845 | |
| 846 | int |
| 847 | pop_retr (server, msgno, arg) |
| 848 | popserver server; |
| 849 | int msgno; |
| 850 | FILE *arg; |
| 851 | { |
| 852 | extern char *strerror (); |
| 853 | char *line; |
| 854 | int ret; |
| 855 | |
| 856 | if (pop_retrieve_first (server, msgno, &line)) |
| 857 | { |
| 858 | char *error = concat ("Error from POP server: ", pop_error, ""); |
| 859 | strncpy (Errmsg, error, sizeof (Errmsg)); |
| 860 | Errmsg[sizeof (Errmsg)-1] = '\0'; |
| 861 | free(error); |
| 862 | return (NOTOK); |
| 863 | } |
| 864 | |
| 865 | while ((ret = pop_retrieve_next (server, &line)) >= 0) |
| 866 | { |
| 867 | if (! line) |
| 868 | break; |
| 869 | |
| 870 | if (mbx_write (line, ret, arg) != OK) |
| 871 | { |
| 872 | strcpy (Errmsg, strerror (errno)); |
| 873 | pop_close (server); |
| 874 | return (NOTOK); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | if (ret) |
| 879 | { |
| 880 | char *error = concat ("Error from POP server: ", pop_error, ""); |
| 881 | strncpy (Errmsg, error, sizeof (Errmsg)); |
| 882 | Errmsg[sizeof (Errmsg)-1] = '\0'; |
| 883 | free(error); |
| 884 | return (NOTOK); |
| 885 | } |
| 886 | |
| 887 | return (OK); |
| 888 | } |
| 889 | |
| 890 | /* Do this as a macro instead of using strcmp to save on execution time. */ |
| 891 | #define IS_FROM_LINE(a) ((a[0] == 'F') \ |
| 892 | && (a[1] == 'r') \ |
| 893 | && (a[2] == 'o') \ |
| 894 | && (a[3] == 'm') \ |
| 895 | && (a[4] == ' ')) |
| 896 | |
| 897 | int |
| 898 | mbx_write (line, len, mbf) |
| 899 | char *line; |
| 900 | int len; |
| 901 | FILE *mbf; |
| 902 | { |
| 903 | #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES |
| 904 | if (IS_FROM_LINE (line)) |
| 905 | { |
| 906 | if (fputc ('>', mbf) == EOF) |
| 907 | return (NOTOK); |
| 908 | } |
| 909 | #endif |
| 910 | if (line[0] == '\037') |
| 911 | { |
| 912 | if (fputs ("^_", mbf) == EOF) |
| 913 | return (NOTOK); |
| 914 | line++; |
| 915 | len--; |
| 916 | } |
| 917 | if (fwrite (line, 1, len, mbf) != len) |
| 918 | return (NOTOK); |
| 919 | if (fputc (0x0a, mbf) == EOF) |
| 920 | return (NOTOK); |
| 921 | return (OK); |
| 922 | } |
| 923 | |
| 924 | int |
| 925 | mbx_delimit_begin (mbf) |
| 926 | FILE *mbf; |
| 927 | { |
| 928 | time_t now; |
| 929 | struct tm *ltime; |
| 930 | char fromline[40] = "From movemail "; |
| 931 | |
| 932 | now = time (NULL); |
| 933 | ltime = localtime (&now); |
| 934 | |
| 935 | strcat (fromline, asctime (ltime)); |
| 936 | |
| 937 | if (fputs (fromline, mbf) == EOF) |
| 938 | return (NOTOK); |
| 939 | return (OK); |
| 940 | } |
| 941 | |
| 942 | int |
| 943 | mbx_delimit_end (mbf) |
| 944 | FILE *mbf; |
| 945 | { |
| 946 | if (putc ('\n', mbf) == EOF) |
| 947 | return (NOTOK); |
| 948 | return (OK); |
| 949 | } |
| 950 | |
| 951 | #endif /* MAIL_USE_POP */ |
| 952 | \f |
| 953 | #ifndef HAVE_STRERROR |
| 954 | char * |
| 955 | strerror (errnum) |
| 956 | int errnum; |
| 957 | { |
| 958 | extern char *sys_errlist[]; |
| 959 | extern int sys_nerr; |
| 960 | |
| 961 | if (errnum >= 0 && errnum < sys_nerr) |
| 962 | return sys_errlist[errnum]; |
| 963 | return (char *) "Unknown error"; |
| 964 | } |
| 965 | |
| 966 | #endif /* ! HAVE_STRERROR */ |
| 967 | |
| 968 | /* arch-tag: 1c323112-41fe-4fe5-8de9-494de631f73f |
| 969 | (do not change this comment) */ |
| 970 | |
| 971 | /* movemail.c ends here */ |